MESON Chess Problem Database

Problem Display
PID: 271663 (8/8/Q1N2k1B/8/Kb3P1N/8/B7/4rnr1 w - - 0 1)

Coello Alonso, Jose Antonio

Petite, Efren

3rd Prize, Buletin Problemistic, 1997

8/8/Q1N2k1B/8/Kb3P1N/8/B7/4rnr1

#2

7 + 5

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Re5
      • 2.fxe5#
    • 1...Rg5
      • 2.fxg5#
  • Tries
    • 1.Sxb4+?
      • 1...Re6
        • 2.Qxe6#
      • 1...Ke7!
    • 1.Se5+?
      • 1...Bd6
        • 2.Qxd6#
      • 1...Ke7!
    • 1.Qd3?
      • threat
        • 2.Qf5#
      • 1...Re5
        • 2.fxe5#
      • 1...Rg5
        • 2.fxg5#
      • 1...Se3
        • 2.Qd4#
      • 1...Sg3
        • 2.Qg6#
      • 1...Re4!
    • 1.Qb5?
      • threat
        • 2.Qf5#
      • 1...Re5
        • 2.Qxe5#
        • 2.fxe5#
      • 1...Rg5
        • 2.Qxg5#
        • 2.fxg5#
      • 1...Se3
        • 2.Qe5#
      • 1...Sg3
        • 2.Qg5#
      • 1...Bc5!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Qf5#
      • 1...Re6
        • 2.Qxe6#
      • 1...Re5
        • 2.fxe5#
      • 1...Rg5
        • 2.fxg5#
      • 1...Se3
        • 2.Qe6#
      • 1...Sg3
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(a);OGATE::P(C),XR(a)
    • R(c);OGATE::P(C),XR(c)
  • Tries
    • Try
      • S(F);CHECK,XB(d)
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAR1(E),XR(a)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • B(d);N_GUARD,P_SPINB(d)::QAR2(E),XB(d)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • R(a);OGATE::P(C),XR(a)
        • R(c);OGATE::P(C),XR(c)
        • S(b);S_CUTR(a)::QAB(E)
        • S(b);S_CUTR(c)::QAR1(E)
      • Refutation
        • R(a);
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • S(b);S_CUTR(a)::QAB1(E)
        • S(b);S_CUTR(c)::QAB1(E)
      • Refutation
        • B(d);
  • Actual
    • Q(E);
    • Threat
      • QAR1(E)
    • Vars
      • R(a);N_GUARD::QAR1(E),XR(a)
      • R(a);OGATE::P(C),XR(a)
      • R(c);OGATE::P(C),XR(c)
      • S(b);S_CUTR(a)::QAR1(E)
      • S(b);S_CUTR(c)::QAB(E)
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